the two LPs I would single out for reccomendation (1 Heldon / 1 solo Pinhas) would be:
Heldon - Heldon - IV "Agneta Nilson" (Urus Records, 1974?) - lots of great burbling moog'n'mellotron meditations, coupled with a some funkier guitar-led tracks.
and
Richard Pinhas - East West (Pulse, 1980?) - probably his most varied solo outing - frosty, glacial electronics meets warped avant-trance and some Tange-like synth workouts. A few tracks sound remarkably like Low-period Bowie. Also includes "Ruitor" which IMHO is one of the most beautiful pieces of electronic music ever recorded.
lots of people rate the late seventies Heldon stuff - Stand By and Interface, but I found them lacking and rather pedestrian.
whereas the very early LP's I have not heard - but Im told they owe a significant stylistic debt to the first two King Crimson Lps.